Improvement in rosin soap



UNITED STATES PATENT OFFIC AUGUSTUS PFALTZ, on sAxonvILLn, MASSACHUSETTS.

IMPROVEMENT lNvROSlN SOAP.

Specification forming part of Letters Patent No. 15,951, dated October 21, 1856.

To all whom it may concern":

Be it known that I, AUGUSTUS PFALTZ, of

Saxonville, in thecounty of Middlesex and State of Massachusetts, have invented an Improvement in the Manufacture of Rosin Soap; I

andI do hereby declare that the same is hereinafter fully set forth and described.

The nature of my invention consists in a mode of producing from common rosin a solid soap, suitable for scouring purposes alone, and which can be used as a substitute for ordinary soap. When we combine with the said soap one-quarter or onethird of its weight of tallow or other fat soaps, the resulting compound is more solid and valuable than the rosin-mixed soap in ordinary use.

My experiments have proved that the sylvic and pinic acids of rosin combine withsoda in different proportions up to a certain pointvand form soft adhesive compounds, and these are all within the proportion of soda used in on dinary soap -making. These compounds, as is well known, attract moisture, and cause the yellow or soap to soften, so that it cannot be shipped to warm climates; but if we add more soda or carbonate of soda to the rosin 'in the process of manufacture of the rosin soap, a firmer compoundresults, inwhich the acids become united to form sub-salts with the soda Forthis reason the rosin soap, when it is to be combined with soaps of the fatty acids, must be made by itself and not, as usual, with a mixture of rosin and fat. Heretofore the so-called rosin soaps have contained a large percentageof water, while by my process this water is dissipated, so that a firm bar may be made of the rosin soap alone without the aid of fats. Thus formed, the rosin soap can be mixed with soap already prepared from fats to make English rosin or mixed soap, with the great advantage of thus forming a solid soap with a small proportion of soap prepared from tallow or fats.

To enable others skilled inthe art to manufacture my soap, I proceed to describe my process.

acids of rosin and soda, I use heat bymeans of steam, the kettles having steam-jackets and For producing the combination between the revolving stirrers moved by power, so as to agitate the mass. Soda-ash dissolved in water to form a clear solution is to be made of sufficient density to mark 36 Baum by boiling or adding more soda-ash. For every pound of rosin one pint of this solution ofnsoda may be taken, and'the rosin being melted sthe solution of soda is added and the whole well mixed by the agitator. Full Steam being applied, the mass is agitated and the water evaporated until a piece, on cooling, becomes solid. The

soap now contains less than ten per cent. of

water, and when made into bars canbe kept Stored without loss of weight. tles heated by fire, instead of steanrkettles,

Common ketmay be used in the manufacture, but an agitator must be adapted to each kettle. The soap as it forms becomes thick, and requires constant stirring to hasten the evaporation of water and to prevent burning. The solid rosin thus produced I call my basis soap, and it may be applied to scouring goods in the manufacture of woolens, (by dissolving one pound in twenty gallons of water.) In the soap manufacture its valuable property of carrying its hardness into any mixture renders easy the production of solid soap containing much rosin, and yet not liable to spontaneous change. I do not claim rosin soap either alone or,-

,sylvic acids, which compounds are rendered nearly anhydrous.

In testimony whereof I have hereunto set mysignature this 17th day of April, A. D. 1856.

AUGUSTUS PFALTZ.

Witnesses:

R. H. EDDY, 

